A range of wood screws that can be used in the fabrication and installation processes of timber window and doors frames. A single thread wood screw has one continuous thread running along the body of the screw and should be screwed into softwood i.e. chipboard, pine etc. A twin thread wood screw has two threads running along the body of the screw and can be used for softwood or hardwood i.e. mahogany, oak etc. as they have two threads, they can be inserted or removed twice as fast as the single thread screws.